mirror of
https://github.com/librenms/librenms.git
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328 lines
11 KiB
PHP
328 lines
11 KiB
PHP
<?php
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/* Copyright (C) 2014 Daniel Preussker <f0o@devilcode.org>
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/**
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* Alerts Tracking
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* @author Daniel Preussker <f0o@devilcode.org>
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* @copyright 2014 f0o, LibreNMS
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* @license GPL
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* @package LibreNMS
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* @subpackage Alerts
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*/
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include_once($config['install_dir'].'/includes/device-groups.inc.php');
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include_once($config['install_dir'].'/html/includes/authentication/'.$config['auth_mechanism'].'.inc.php');
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/**
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* Generate SQL from Rule
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* @param string $rule Rule to generate SQL for
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* @return string|boolean
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*/
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function GenSQL($rule) {
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$rule = RunMacros($rule);
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if( empty($rule) ) {
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//Cannot resolve Macros due to recursion. Rule is invalid.
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return false;
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}
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//Pretty-print rule to dissect easier
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$pretty = array('*' => ' * ', '(' => ' ( ', ')' => ' ) ', '/' => ' / ', '&&' => ' && ', '||' => ' || ', 'DATE_SUB ( NOW ( )' => 'DATE_SUB( NOW()');
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$rule = str_replace(array_keys($pretty),$pretty,$rule);
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$tmp = explode(" ",$rule);
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$tables = array();
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foreach( $tmp as $opt ) {
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if( strstr($opt,'%') && strstr($opt,'.') ) {
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$tmpp = explode(".",$opt,2);
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$tmpp[0] = str_replace("%","",$tmpp[0]);
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$tables[] = mres(str_replace("(","",$tmpp[0]));
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$rule = str_replace($opt,$tmpp[0].'.'.$tmpp[1],$rule);
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}
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}
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$tables = array_keys(array_flip($tables));
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if( dbFetchCell('SELECT 1 FROM information_schema.COLUMNS WHERE TABLE_NAME = ? && COLUMN_NAME = ?',array($tables[0],'device_id')) != 1 ) {
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//Our first table has no valid glue, append the 'devices' table to it!
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array_unshift($tables, 'devices');
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}
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$x = sizeof($tables)-1;
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$i = 0;
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$join = "";
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while( $i < $x ) {
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if( isset($tables[$i+1]) ) {
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if( dbFetchCell('SELECT 1 FROM information_schema.COLUMNS WHERE TABLE_NAME = ? && COLUMN_NAME = ?',array($tables[$i+1],'device_id')) == 1 ) {
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//Found valid glue in definition.
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$join .= $tables[$i].".device_id = ".$tables[$i+1].".device_id && ";
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} else {
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//No valid glue, Resolve a glue-chain.
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$gtmp = ResolveGlues(array($tables[$i+1]),'device_id');
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if( $gtmp === false ) {
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//Cannot resolve glue-chain. Rule is invalid.
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return false;
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}
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$last = "";
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$qry = "";
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foreach( $gtmp as $glue ) {
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if( empty($last) ) {
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list($tmp,$last) = explode('.',$glue);
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$qry .= $glue.' = ';
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} else {
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list($tmp,$new) = explode('.',$glue);
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$qry .= $tmp.'.'.$last.' && '.$tmp.'.'.$new.' = ';
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$last = $new;
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}
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if( !in_array($tmp, $tables) ) {
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$tables[] = $tmp;
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}
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}
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$join .= "( ".$qry.$tables[0].".device_id ) && ";
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}
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}
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$i++;
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}
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$sql = "SELECT * FROM ".implode(",",$tables)." WHERE (".$join."".str_replace("(","",$tables[0]).".device_id = ?) && (".str_replace(array("%","@","!~","~"),array("","%","NOT LIKE","LIKE"),$rule).")";
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return $sql;
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}
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/**
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* Create a glue-chain
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* @param array $tables Initial Tables to construct glue-chain
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* @param string $target Glue to find (usual device_id)
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* @param int $x Recursion Anchor
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* @param array $hist History of processed tables
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* @param array $last Glues on the fringe
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* @return string|boolean
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*/
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function ResolveGlues($tables,$target,$x=0,$hist=array(),$last=array()) {
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if( sizeof($tables) == 1 && $x != 0 ) {
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if( dbFetchCell('SELECT 1 FROM information_schema.COLUMNS WHERE TABLE_NAME = ? && COLUMN_NAME = ?',array($tables[0],$target)) == 1 ) {
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return array_merge($last,array($tables[0].'.'.$target));
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} else {
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return false;
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}
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} else {
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$x++;
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if( $x > 30 ) {
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//Too much recursion. Abort.
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return false;
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}
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foreach( $tables as $table ) {
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$glues = dbFetchRows('SELECT COLUMN_NAME FROM information_schema.COLUMNS WHERE TABLE_NAME = ? && COLUMN_NAME LIKE "%\_id"',array($table));
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if( sizeof($glues) == 1 && $glues[0]['COLUMN_NAME'] != $target ) {
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//Search for new candidates to expand
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$tmp = dbFetchRows('SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_NAME LIKE "'.substr($table,0,-1).'_%" && TABLE_NAME != "'.$table.'"');
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$ntables = array();
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foreach( $tmp as $expand ) {
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$ntables[] = $expand['TABLE_NAME'];
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}
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$tmp = ResolveGlues($ntables,$target,$x++,array_merge($tables,$ntables),array_merge($last,array($table.'.'.$glues[0]['COLUMN_NAME'])));
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if( is_array($tmp) ) {
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return $tmp;
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}
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} else {
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foreach( $glues as $glue ) {
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if( $glue['COLUMN_NAME'] == $target ) {
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return array_merge($last,array($table.'.'.$target));
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} else {
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list($tmp) = explode('_',$glue['COLUMN_NAME']);
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$tmp .= 's';
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if( !in_array($tmp,$tables) && !in_array($tmp,$hist) ) {
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//Expand table
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$tmp = ResolveGlues(array($tmp),$target,$x++,array_merge($tables,array($tmp)),array_merge($last,array($table.'.'.$glue['COLUMN_NAME'])));
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if( is_array($tmp) ) {
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return $tmp;
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}
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}
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}
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}
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}
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}
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}
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//You should never get here.
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return false;
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}
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/**
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* Process Macros
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* @param string $rule Rule to process
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* @param int $x Recursion-Anchor
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* @return string|boolean
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*/
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function RunMacros($rule,$x=1) {
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global $config;
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krsort($config['alert']['macros']['rule']);
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foreach( $config['alert']['macros']['rule'] as $macro=>$value ) {
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if( !strstr($macro," ") ) {
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$rule = str_replace('%macros.'.$macro,$value,$rule);
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}
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}
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if( strstr($rule,"%macros") ) {
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if( ++$x < 30 ) {
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$rule = RunMacros($rule,$x);
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} else {
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return false;
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}
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}
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return $rule;
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}
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/**
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* Get Alert-Rules for Devices
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* @param int $device Device-ID
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* @return array
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*/
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function GetRules($device) {
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$groups = GetGroupsFromDevice($device);
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$params = array($device,$device);
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$where = "";
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foreach( $groups as $group ) {
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$where .= " || alert_map.target = ?";
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$params[] = 'g'.$group;
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}
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return dbFetchRows('SELECT alert_rules.* FROM alert_rules LEFT JOIN alert_map ON alert_rules.id=alert_map.rule WHERE alert_rules.disabled = 0 && ( (alert_rules.device_id = -1 || alert_rules.device_id = ? ) || alert_map.target = ? '.$where.' )',$params);
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}
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/**
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* Check if device is under maintenance
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* @param int $device Device-ID
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* @return int
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*/
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function IsMaintenance( $device ) {
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$groups = GetGroupsFromDevice($device);
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$params = array($device);
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$where = "";
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foreach( $groups as $group ) {
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$where .= " || alert_schedule_items.target = ?";
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$params[] = 'g'.$group;
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}
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return dbFetchCell('SELECT DISTINCT(alert_schedule.schedule_id) FROM alert_schedule LEFT JOIN alert_schedule_items ON alert_schedule.schedule_id=alert_schedule_items.schedule_id WHERE ( alert_schedule_items.target = ?'.$where.' ) && NOW() BETWEEN alert_schedule.start AND alert_schedule.end LIMIT 1',$params);
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}
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/**
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* Run all rules for a device
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* @param int $device Device-ID
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* @return void
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*/
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function RunRules($device) {
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global $debug;
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if( IsMaintenance($device) > 0 ) {
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echo "Under Maintenance, Skipping alerts.\r\n";
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return false;
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}
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foreach( GetRules($device) as $rule ) {
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echo " #".$rule['id'].":";
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$inv = json_decode($rule['extra'],true);
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if( isset($inv['invert']) ) {
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$inv = (bool) $inv['invert'];
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} else {
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$inv = false;
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}
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$chk = dbFetchRow("SELECT state FROM alerts WHERE rule_id = ? && device_id = ? ORDER BY id DESC LIMIT 1", array($rule['id'], $device));
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$sql = GenSQL($rule['rule']);
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$qry = dbFetchRows($sql,array($device));
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$s = sizeof($qry);
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if( $s == 0 && $inv === false ) {
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$doalert = false;
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} elseif( $s > 0 && $inv === false ) {
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$doalert = true;
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} elseif( $s == 0 && $inv === true ) {
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$doalert = true;
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} else { //( $s > 0 && $inv == false ) {
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$doalert = false;
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}
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if( $doalert ) {
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if( $chk['state'] === "2" ) {
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echo " SKIP ";
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} elseif( $chk['state'] >= "1" ) {
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echo " NOCHG ";
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} else {
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$extra = gzcompress(json_encode(array('contacts' => GetContacts($qry), 'rule'=>$qry)),9);
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if( dbInsert(array('state' => 1, 'device_id' => $device, 'rule_id' => $rule['id'], 'details' => $extra),'alert_log') ) {
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if( !dbUpdate(array('state' => 1, 'open' => 1),'alerts','device_id = ? && rule_id = ?', array($device,$rule['id'])) ) {
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dbInsert(array('state' => 1, 'device_id' => $device, 'rule_id' => $rule['id'], 'open' => 1),'alerts');
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}
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echo " ALERT ";
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}
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}
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} else {
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if( $chk['state'] === "0" ) {
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echo " NOCHG ";
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} else {
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if( dbInsert(array('state' => 0, 'device_id' => $device, 'rule_id' => $rule['id']),'alert_log') ){
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if( !dbUpdate(array('state' => 0, 'open' => 1),'alerts','device_id = ? && rule_id = ?', array($device,$rule['id'])) ) {
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dbInsert(array('state' => 0, 'device_id' => $device, 'rule_id' => $rule['id'], 'open' => 1),'alerts');
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}
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echo " OK ";
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}
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}
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}
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}
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}
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/**
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* Find contacts for alert
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* @param array $results Rule-Result
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* @return array
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*/
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function GetContacts($results) {
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global $config;
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if( sizeof($results) == 0 ) {
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return array();
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}
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if( $config['alert']['default_only'] == true || $config['alerts']['email']['default_only'] == true ) {
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return array(''.($config['alert']['default_mail'] ? $config['alert']['default_mail'] : $config['alerts']['email']['default']) => 'NOC');
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}
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$users = get_userlist();
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$contacts = array();
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$uids = array();
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foreach( $results as $result ) {
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$tmp = NULL;
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if( is_numeric($result["bill_id"]) ) {
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$tmpa = dbFetchRows("SELECT user_id FROM bill_perms WHERE bill_id = ?",array($result["bill_id"]));
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foreach( $tmpa as $tmp ) {
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$uids[$tmp['user_id']] = $tmp['user_id'];
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}
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}
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if( is_numeric($result["port_id"]) ) {
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$tmpa = dbFetchRows("SELECT user_id FROM ports_perms WHERE access_level >= 0 AND port_id = ?",array($result["port_id"]));
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foreach( $tmpa as $tmp ) {
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$uids[$tmp['user_id']] = $tmp['user_id'];
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}
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}
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if( is_numeric($result["device_id"]) ) {
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$tmpa = dbFetchRow("SELECT sysContact FROM devices WHERE device_id = ?",array($result["device_id"]));
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$contacts[$tmpa["sysContact"]] = "NOC";
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$tmpa = dbFetchRows("SELECT user_id FROM devices_perms WHERE access_level >= 0 AND device_id = ?", array($result["device_id"]));
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foreach( $tmpa as $tmp ) {
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$uids[$tmp['user_id']] = $tmp['user_id'];
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}
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}
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}
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foreach( $users as $user ) {
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if( empty($user['email']) ) {
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continue;
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} elseif( empty($user['realname']) ) {
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$user['realname'] = $user['username'];
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}
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$user['level'] = get_userlevel($user['username']);
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if( $config["alert"]["globals"] && ( $user['level'] >= 5 && $user['level'] < 10 ) ) {
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$contacts[$user['email']] = $user['realname'];
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} elseif( $config["alert"]["admins"] && $user['level'] == 10 ) {
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$contacts[$user['email']] = $user['realname'];
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} elseif( in_array($user['user_id'],$uids) ) {
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$contacts[$user['email']] = $user['realname'];
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}
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}
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return $contacts;
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}
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?>
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